Can I use a CD Key from another CD when I install my Windows XP Home?

v3cy

New member
I want to re-install my Windows XP Home OS (downgrading from Win7), but I lost my CD Key for it. A friend of mine gave me a CD Key, but it's for Xp Pro. Can I use that? If I can't, can I use those XP Home CD Keys you find on the internet? Any help would be very much appreciated. Thanks.
 
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